Kinematic surprises in twisted-particle collisions
Kinematic surprises in twisted-particle collisions
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DOI：
10.1103/physrevd.101.016007
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发表时间：
2019-11
影响因子：
5
通讯作者：
Igor P. Ivanov;N. Korchagin;A. Pimikov;Pengming Zhang
中科院分区：
文献类型：
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作者：
Igor P. Ivanov;N. Korchagin;A. Pimikov;Pengming Zhang
“扭曲粒子”是指光子、电子、强子或任何其他粒子的非平面波状态，这些粒子相对于它们的平均传播方向具有非零的、可调节的轨道角动量。扭曲的光子和电子已经在实验中得到了证明，人们可以期待在未来创造出其他粒子的扭曲状态。这样的状态可以在碰撞中产生，为对撞机实验提供了一个全新的自由度，特别是为强子物理提供了一个新的工具。我们最近证明了两个扭曲粒子的2→1过程，如扭曲e+e-湮灭中的共振产生，可以获得在通常的平面波碰撞中难以或不可能探测到的观测值。在本文中，我们详细讨论了这一过程令人惊讶的运动学特征，重点是无自旋粒子湮灭。它们包括：1)在扭转湮灭中可用的最终动量空间中增加了一个新的维度；2)在横截面中出现的干涉条纹作为总能量的函数；3)这一过程内置的质谱能力，即在固定能量下运行的单色扭曲粒子湮灭实验中，同时产生不同质量的几个共振并自动进行角分离。这些特征在通常的平面波碰撞条件下是无法得到的。
“Twisted particles” refer to non-plane-wave states of photons, electrons, hadrons, or any other particles which carry nonzero, adjustable orbital angular momentum with respect to their average propagation direction. Twisted photons and electrons have already been experimentally demonstrated, and one can expect creation of twisted states of other particles in the future. Such states can be brought in collisions, offering a completely new degree of freedom in collider experiments and, especially, a novel tool for hadronic physics. We recently showed that 2→1 processes with two twisted particles such as resonance production in twisted e+e- annihilation give access to observables which are difficult or impossible to probe in the usual plane wave collisions. In this paper, we discuss in detail surprising kinematic features of this process, focusing on spinless particle annihilation. They include 1) a new dimension in the final momentum space available in twisted annihilation, 2) interference fringes emerging in the cross section as a function of the total energy, and 3) the built-in mass spectrometric capability of this process, that is, simultaneous production and automatic angular separation of several resonances with different masses in monochromatic twisted particle annihilation experiment running at fixed energy. All these features cannot be obtained in the usual plane wave collision setting.